On Tuesday, May 31, 2016 , in accordance with the deprecation schedule , v201502 of the DFP API will be sunset. At that time, any requests made to v201502 will return errors.
If you're still using v201502, now's the time to upgrade to the latest release  and take advantage of new features like vCPM  support. To do so, check the release notes  to identify any breaking changes, grab the latest version of your client library  and update your code.
Some changes to look out for:
This is not an exhaustive list, so as always, don't hesitate to reach out to us  with any questions. To be notified of future deprecations and sunsets, join the DFP API Sunset Announcements  group and adjust your notification settings.
Chris Seeley , DFP API Team